CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Li He,Di Yang,Hainan Zhao,Luyao Wei,Dashuai Wang,Yizhan Wang,Gang Chen,Yingjin Wei
The confinement and catalysis properties of orthorhombic CoSe 2 as a host material for Li-S battery are studied by theoretical and experimental methods. First-principles calculations show that the (111) surface of CoSe 2 possesses adjacent nucleophilic and electrophilic centers. This bi-polar surface can easily bond the polysulfide molecules and catalyze their conversion reactions. As a result, the decomposition energy barriers of polysulfides are greatly decreased from ∼3.0 eV to 0.2–0.4 eV. Following theoretical prediction, CoSe 2 nanocrystals with specific (111) surface are prepared and embedded in porous carbon nanocages using ZIF-67 metal organic framework as a template. Benefited from the advantages of porous C and CoSe 2 (111) surface, the shuttling of polysulfides is suppressed and their conversion kinetics is facilitated. The Li-S cell using this host material exhibits high capacity and remarkable cycle stability, showing a discharge capacity of 1199 mA·h·g −1 at 0.2C and 400 stable cycles at 1.0C.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Donghai Wei,Yinglong Wu,Yan Nie,Junfei Duan,Chenhao Cao,Jianghong Wu,Lingjun Li,Zhaoyong Chen,Guanhua Zhang,Huigao Duan
Red phosphorus (RP), as one of the most promising anode materials for lithium-ion batteries, attracts much attention for its high theoretical specific capacity, cost-effective, and commercial availability. However, poor cycling stability and rate capability caused by huge volume expansion and low intrinsic electronic conductivity hinder the commercialization of RP-based anode. Herein, RP confined in ultrathin hollow carbon-bubble-constructed foam (RP-HC) is developed to improve electronic conductivity and mechanical structure stability. Additionally, low-temperature atomic layer deposition (LT-ALD) technology is adopted to further modify the surface of the RP-HC, forming a core–shell RP-HC@TiO 2 structure with about 5 nm TiO 2 coating layer. Benefiting from the dual confinement of TiO 2 buffer layer and conductive porous carbon host with effective P O C bond, the RP-HC(70%)@TiO 2 electrode delivers an outstanding cycling performance (795.2 mAh g −1 after 200 cycles at 100 mA g −1 ) and rate capability (459.9 mAh g −1 at 2000 mA g −1 , almost 1.6 times and 12 times relative to RP-HC(70%) and RP under the same test condition). In-situ electrochemical impedance spectroscopy analyses are also conducted to investigate the superior Li + storage properties of the RP-HC@TiO 2 .
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 5
·056523
·
IF 4.386
Chuanhui Zhu,Guo-Hong Cai,Chongyang Yuan,Bin Huang,Guangqin Li,Mark Croft,Martha Greenblatt,Man-Rong Li
Exploring a simple model system to realize the intrinsic guidelines of activity for oxide electrocatalysts is urgent and important. Here, we introduce delafossite oxides A2IrO3 (A = Li, Na, Cu) as a family of oxygen evolution reaction electrocatalysts in alkaline media. We show that, in Cu2IrO3, the intrinsic intersite charge transfer between Cu and Ir improves the electrocatalytic activity by simultaneously increasing the conductivity and reducing the Tafel slope down to 51 mV dec−1 with an overpotential η10 = 361 mV. Through a comparative study, the improved activity of Cu2IrO3 is attributed to the increase of Ir 5d projected electronic density of states with extended Ir–O bond length. This study provides insights into advanced catalyst design through tailoring the active site of oxides by the modulation of electronic states in a given structural motif.
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高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Jinfeng Sun,Lingzhi Guo,Miaomiao Gao,Xuan Sun,Jinyang Zhang,Longwei Liang,Yang Liu,Linrui Hou,Changzhou Yuan
Herein, we first report one-step synthesis of uniform Mo 2 C microflowers (MCMFs) from low-cost precursors via industrialized solid-state strategy. With fine optimization in precursor ratio and pyrolysis temperatures, the as-fabricated MCMFs are assembled well with interconnected single-crystalline nanosheet subunits. More encouragingly, the resultant MCMFs are further highlighted as a competitive anode with robust and long-duration lithium-storage behaviors towards high-performance Li-ion batteries
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yi Yang,Ling Gao,Liming Shen,Ningzhong Bao
With the revival of lithium metal anodes , there is an urgent need for matching cathodes to form the next generation batteries with high-capacity and low-cost. A porous hierarchical structure containing FeF 3 nanocrystals (3–9 nm) capsulated in conductive carbon nanocages (40–110 nm) was fabricated. The morphology and size of the FeF 3 nanocrystals were influenced by the existence of carbon nanocage. During the preparation process, the carbon nanocage inhibited the growth of FeF 3 crystals. During the dis/charge process, the carbon nanocages not only restricted the complex conversion reaction (Fe 3+ ⇄ Fe 2+ ⇄ Fe) within the confined space, but also functioned as a bridge for the transmission of electrons, thus enhancing the electrochemical performance of the electrode. As a result, the FeF 3 /C electrode delivered an excellent reversible capacity of 410 mA h g −1 over 120 cycles at 100 mA g −1 .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Peiran Tan,Yueming Wang,Xiangru Sun,Ying Zhou,Hongyang Dong,Yan Han,Dejun Li
Li metal is considered an ideal anode for the next-generation rechargeable batteries due to the high specific capacity and ultralow redox potential . However, the growth of Li dendrites severely impedes its application. In this study, a structural Li anode is constructed by decorating the copper phosphide nanowires modified copper mesh (PCM) on Li surface. A self-limiting Li deposition with dendrite-free feature is achieved based on the rational surface chemical and structural engineering of the Li anode. On the one hand, the meshed PCM layer as well as its lithiated species performs excellent lithiophilicity and favorable electron/ion conductivity, effectively reducing the Li nucleation barrier and redistributing the electric field and Li + flux. This promotes a preferential and uniform Li deposition. On the other hand, the suitable combination between PCM and Li not only ensures excellent electrical contact for fast charge transfer, but also establishes a well-balanced structure with abundant active sites and large space for Li nucleation and deposition. Moreover, the meshed surface structure effectively accommodates the volume change of Li during plating/stripping. And the multiplied compressive stress between the PCM and separator greatly suppresses Li growth in vertical direction and promotes a dense Li morphology. Consequently, a self-limiting and highly reversible Li plating/stripping along the horizontal direction is achieved, even at a high areal capacity of 10 mA h cm –2 . The Li deposition preferentially occurs on the PCM skeleton and gradually expands horizontally into the meshed space, without obvious formation of Li dendrites. The symmetrical cells show excellent cycling stability for over 1700 h with a low overpotential (13.1 mV at 1500 h) at 1 mA cm –2 . Furthermore, the cells paired with LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode also show excellent cycling stability for over 450 cycles.
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高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·Vol. 45
·期 7
·2300645
·
IF 4.2
Chengliang Wang,Xu Zhang,Xiaofei Sun,Yan Zhang,Qingfu Wang,Jingjiang Sun
In this work, hyperbranched polycarbonate-poly(ethylene oxide) (PEO)-based solid polymer electrolytes (HBPC-SEs) are successfully synthesized via a straightforward organo-catalyzed “A 1 ”+“B 2 ”-ring-opening polymerization approach. The temperature-dependent ionic conductivity of HBPC-SEs, composed of different polycarbonate linkages and various LiTFSI concentrations, is investigated. The results demonstrate that HBPC-SE with an ether-carbonate alternating structure exhibits superior ionic conductivity, attributed to the solubility of Li salts in the polymer matrix and the mobility of the polymer segments. The HBPC1-SE with 30 wt% LiTFSI presents the highest ionic conductivities of 2.15 × 10 −5 , 1.78 × 10 −4 , and 6.07 × 10 −4 Scm −1 at 30, 60, and 80 °C, respectively. Compared to traditional PEO-based electrolytes, the incorporation of polycarbonate segments significantly enhances the electrochemical stability window (5 V) and Li + transference number (0.53) of HBPC-SEs. Furthermore, the LiFePO 4 /HBPC1-SE-3/Li cell exhibits exceptional rate capability and long-cycling performance, maintaining a discharge capacity of 130 mAh g −1 at 0.5C with a capacity retention of 95% after 300 cycles.
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高影响因子
JAPANESE JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 61
·期 6
·062002
·
IF 1.491
Lei Wang,Subiyinuer Jilili,Ayinuremu Tuerxun,Aierken Sidike,Qingling Wang
A series of Tb3+, Eu3+, Li+ co-doped SrSiO3 phosphors were prepared using the high-temperature solid-phase method. The X-ray diffraction results showed that Tb3+ and Eu3+ successfully entered into the SrSiO3 matrix lattice. Strong energy transfer from Tb3+ to Eu3+ is exhibited with a calculated energy transfer efficiency of 94.7%. Doping of the charge compensator Li+ increased the luminescence intensity of the SrSiO3:6%Tb3+, 6%Eu3+, 3%Li+ phosphor at a wavelength of 614 nm by 4.2 times and significantly improved the color purity of this phosphor (Cp = 85.9%). Based on color coordinate analysis, the phosphor color coordinates are located near (0.615, 0.365), which belongs to the red region. The phosphor was integrated into a white LED. The resultant package exhibited a color temperature of 6479 K and a color rendering index of 93.8. Its luminous performance was also very stable under different drive currents.
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高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yuanyuan Ren,Xingguang Lu,Yuanbo Han,De Li,Yong Chen
Spinel Li4Ti5O12 is a well-known two-phase anode material, which can deliver a large specific capacity over a wide voltage window, and the kinetics of the two-phase boundary is very important to the electrochemical properties. In this work, a dense Li4Ti5O12 single-particle microelectrode is prepared by the transient electric-arc heating, and its electrochemical properties are measured over a wide voltage window in Li-ion batteries, which delivers an ultralow-potential discharge plateau. According to electrochemical, in situ electrochemical impedance spectroscopy, Raman, and optical results, an unsymmetrical core–shell model is proposed as discharging through the α/γ two-phase transition and charging through the α/β two-phase transition, in which the Li-ion insertion into the two-phase interface is switched off for the β phase at a low potential and switched on for the γ phase at an ultralow potential. Therefore, this study provides new insights into the electrochemical behaviors of spinel Li4Ti5O12 and sheds light on some other two-phase materials, such as olivine LiFePO4 and spinel LiCrTiO4.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Dabing Li,Liuyang Cao,Chaodeng Liu,Guoqin Cao,Junhua Hu,Jingbo Chen,Guosheng Shao
The composite polymer electrolytes , consisting of a flexible matrix and superb fast ion conductor are promising for large-scale practical application in safer lithium metal batteries . The quantification of polymer structure evolution induced by the inorganic filler was rarely reported. Here, a designer cubic argyrodite Li 6 PS 5 X sulfide electrolyte was fabricated by a solid reaction. A stoichiometry deviation by increasing S and Li, reducing Cl contents, leads to a novel electrolyte of Li 6.25 PS 5.25 Cl 0.75 with high conductivity of 1.0 mS cm −1 and low activation energy of 0.14 eV at room temperature . The off-stoichiometry Li 6 PS 5 X sulfide electrolyte Li 6.25 PS 5.25 Cl 0.75 was used as active filler for polyethylene oxide . Small angle X-ray scattering experiment indicates that the Li 6.25 PS 5.25 Cl 0.75 triggers a pronounced structure evolution in the matrix. As a result, Li-ion diffusion pathway is expanded significantly by the Li 6.25 PS 5.25 Cl 0.75 additives. An optimum ionic conductivity of 1.4 mS cm −1 at 70 °C for CPEs-1 was obtained, and a LFP/Li demo battery delivers a high capacity retention of 91.1% for 100 cycles at 0.2 C.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tie Liu
The geometric design of atomically dispersed 'framework-active sites' grafted with carbonaceous materials to establish a well-connected three-dimensional network represents a compelling strategy for enhancing the performance of lithium-oxygen batteries, particularly in terms of cyclability. This paper introduces a simple approach that utilizes self-assembly heterogeneous nucleation to fabricate discrete bimetallic (Co, Ni) micron lattices grafted onto CNTs, exhibiting commendable surface properties. This intriguing hierarchical structure optimally harnesses the profound structural effects of CNTs weaving matrix, thereby imparting essential properties to the cathode, including high catalytic activity, intrinsically accessible active sites, and continuous porosity to accommodate discharge products. And such binary metal-nitride grafted configuration is significant in mitigating the embarrassing presence of nitrides (low conductivity) and carbon material (inferior activity). Consequently, cell measurement results indicate that a comparable capacity of 8599.7 mA h g⁻¹ and cyclic performance exceeding 200 cycles are achieved in a semi-solid state battery, outperforming commercially available RuC catalysts. And the DFT calculations further demonstrate the strong electronic coupling transfer and exceptional bifunctional activity observed in this binary metal-nitride sample. Therefore, this work exemplifies both steerable preparation techniques and the considerable potential inherent in geometric design for bimetallic sites grafted with carbonaceous material-based catalysts as they transition from Li-O 2 to Li-air batteries.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Huaxiong Liu,Biao Chen,Hongye Qin,Ning Wang,Enzuo Liu,Chunsheng Shi,Naiqin Zhao
Transition metal dichalcogenides (TMDs) have been widely studied as a promising sulfur host material in Li-S batteries due to their unique physical and chemical properties. Great efforts have been made to prepare carbon/TMDs, especially graphene/TMDs heterostructures as the cathodes of Li-S batteries. Recently, ReS 2 shows a new 1T′ phase and great potential in Li-S batteries because of its stable structure and a large amount of catalytic active sites. Herein, we prepared a new ReS 2 nanosheets anchored on rGO (rGO/1T′-ReS 2 ) composite as a lithium polysulfides (LiPSs) immobilizer and electrocatalyst for Li-S batteries. The unique pore structure and rGO incorporation can effectively mitigate volume expansion and enhance electronical conductivity. Moreover, the novel 1T′ phase of ReS 2 shows both efficient chemical adsorption function and large electrocatalytic active sites of LiPSs . These advantages have been demonstrated by both characterization techniques and theoretical calculations. As a result, the rGO/1T′-ReS 2 /S nanosheets display significantly enhanced coulombic efficiency, rate performance and cycling stability compared with the rGO/S nanosheets and the rGO/1T′-ReS 2 /S nanospheres.
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高影响因子
危险品化学品经营许可证（带存储）